Students love cool teachers. So they are teachers out there that tries to be cool enough to develop a closer relationship with the students, and it works at times. But there are teachers out there that're too cool, that the students ended up disrespecting them. If the teacher gives them assignment, the students will think,"Eh, it's just Mr. T's work. He wouldn't care if I don't do it.". Basically students view them as not caring rather than being cool. So there are limits to being a cool teacher. I think teachers should be strict in some areas despite being cool. Try to subtly relate to the students rather than just being a "rad teacher".